We study the electronic transport of one-dimensional Fibonacci dimer superlattices (SL). We examine numerically the effect of introducing the dimer on the nature of the states of dimer Fibonacci semiconductor superlattices. The transmission coefficient is statistically computed within the transfer-matrix formalism. We consider AlxGa1-xAs/GaAs layers having identical thickness...
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One promising approach to achieve high precision spectrum sensing in a cognitive radio (CR) system is the energy detector based on Wavelet Packet Transform (WPT). However, energy detector spectrum sensing is affected by the Signal to Noise Ratio (SNR). When the SNR is lower than 5 dB, an energy detector may falsely determine some unoccupied sub-channels as occupied [16]. In this paper, a new noise...
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We report on progress made in developing a polarimetric and multispectral imaging (MSI) camera that uses a coded filter mask to record spectral data on either a single frame or only a few frames depending on the design of the mask and the application. The design uses commercially available variable filters and beamsplitters to record spectral data simultaneously on a focal plane array, thus negati...
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This paper proposes new processor architecture for accelerating data-parallel applications based on the combination of VLIW and vector processing paradigms. It uses VLIW architecture for processing multiple independent scalar instructions concurrently on parallel execution units. Data parallelism is expressed by vector ISA and processed on the same parallel execution units of the VLIW architecture...
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Digital standard cell library become an essential part of digital design flow and the success of integrated circuits; however, with the growing complexity in cell models, generation of a large digital cell library has increased the required processing jobs by 1000x in recent years. Recently users can find library files sized in gigabytes instead of megabytes, which requires a system that runs reli...
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As VLSI technology scales toward 45nm and beyond, both timing and power performance of integrated circuits are increasingly affected by process variations. Well proximity effects contribute with a non-negligible amount of time and power variation on recent technology. Therefore the well proximity-based extraction flow has become a candidate to accurately capture the process variations and hence mo...
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Library characterization is an essential part of digital design flow and the success of integrated circuits; however, with the growing complexity in cell models, characterization of a large digital cell library has increased the number of simulation jobs by 1000x in recent years. Recently users can find library files sized in gigabytes instead of megabytes, which requires a system that runs reliab...
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This paper proposes a novel Carrier Sensing Multiple Access with Collision Avoidance (CSMA-CA) scheme for multi-hop wireless networks. The proposed protocol provides up to a six-fold delay reduction, up to 20% energy consumption saving and doubles throughput compared with other CSMA-CA protocols, notably those employed in the IEEE 802.11 and IEEE 802.15.4 standards. These bountiful benefits are en...
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This paper presents a non-invasive and wearable optical technique to monitor physiological assessment by means of photoplethysmography (PPG). The study aims to research into an effective way to capture human critical physiological parameters, i.e. oxygen saturation (SaO2%), heart rate, respiration rate through a well contracted and wearable patch probe together with a real-time and secure wireless...
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This paper presents the design of phase retarders for the C and the L bands using two perpendicular reflective metals coated with a single layer thin film. The overall reflection of 76% is achieved for the phase retarder. Error analysis for the device is also presented.
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This paper presents the design and simulation of hybrid rectangular printed strip monopole dielectric resonator antenna (HRPSMDRA) for ultra wideband communication systems. The designed HRPSMDRA is analyzed and optimized using power modeling software CST Microwave Studio ®. The designed HRPSMDRA assembly consists of hybridizing an annular hexagon dielectric resonator (DR) with a rectangular...
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The use of passive radar for detection of targets of different type has gained considerable popularity in past few years. This radar uses the so-called the ”signals of the opportunities” which are already in the environment. These opportunistic signals can be of different types, both in terms of frequency and modulation type. Therefore, instead of designing a separate hardware receiv...
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Primary Backup Replication (PBR) suffers from the bottleneck problem at the primary, single point of failure, poor scalability, and imbalanced utilization of computing resources. These shortcomings are mainly due to the exclusive role of the primary in accepting and executing client's requests. In this paper, we tackle this problem and propose a novel approach that distributes the primary role amo...
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The paper presents a new compact reconfigurable bandstop filter using Defected Ground Structure (DGS). The proposed reconfigurable bandstop filter is constructed by employing coupled DGS resonators etched in the ground plane. The bandstop filter consists of symmetrical DGS resonators with a microstrip excitation to obtain a bandstop filter response. The reconfigurability is achieved by short circu...
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Controlling particle size, shape, nucleation, and self-assembly on surfaces are some of the main challenges facing electronic device fabrication. In this work, growth of gold nanoparticles over a wide range of sizes was investigated by using a novel wet chemical method, where potassium iodide is used as the reducing solution and gold chloride as the metal precursor, on silicon substrates. Four par...
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We analyze mode oscillation and noise of semiconductor lasers with strong asymmetric gain suppression and subjected to sinusoidal modulation. The mode competition (MC) due to strong gain suppression is measured by the correlation coefficients among the oscillating modes. We show that the increase in the modulation depth changes mode coupling from anti-correlation to positive correlation and then t...
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Fire Control Systems (FCSs) plays a critical role in the battle effectiveness of a Main Battle Tank (MBT) whether it is high first-round-hit-probability, ballistic solution computation for projectile trajectory, or moving target engagement. FCS comprises of Fire Control Computer (FCC), sensors, and gun controller. Fire control computer computes the elevation and azimuth (pitch and yaw axis) angles...
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In this we have looked at the concept of introducing carbon nanotubes on the surfaces of the microstrip patch antennas. We examined the performance improvements in a patch antenna through finite difference time domain simulations to increase the efficiency of the antenna. The results suggest that carbon nanotubes lead to a higher gain due to their electrical properties. A high gain antenna with lo...
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Simulation is a widely accepted tool for evaluating any proposed cache system under different application and configuration scenarios because of the high degree of configurability of cache memory which requires extensive design space exploration and identification of performance bottlenecks in system understudy. In this paper we have presented a new multi-level cache Simulator, 'MCSMC' (Multi-leve...
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Novel low cost deposition technique for p-n junction preparation has been performed for low temperature deposition. The substrate was dipped in a precursor followed by solid state reaction at 200°C. Nano-structured films were produced as multi-layers. The technique has been employed for binary and ternary metal sulfides thin films ZnCdS and Cu2S as well as p-n junction preparation. X-ray di...
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In this paper a multi-layered structure containing metamaterial is investigated theoretically and numerically. Low reflection and high absorption of electromagnetic waves by the structure are demonstrated at specified frequencies. In the theory, the required equations for the electric and magnetic fields of the incident waves are given in detail. Expressions for the overall reflection and absorpti...
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Overlapping pulse position modulation-optical code division multiple access (OPPM-OCDMA) is a well known technique to enhance spectral efficiency and to increase the number of effective users in the system. However, on the other hand overlapping may result in increasing levels of multiple access interference (MAI) that significantly reduces the capacity of the system. To mitigate MAI, we make use ...
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